photosynthesis

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Across
  1. 2. it is a green stain that comes from the grass
  2. 4. scientists make sure they only change one variable in all experiments
  3. 7. plants breathe it out
  4. 8. it is how plants grow
Down
  1. 1. we drink it and we also need it to live
  2. 2. plants inhale it
  3. 3. it travels in a straight line
  4. 5. it causes heat in our body and it also has something to do with our breathing
  5. 6. the control center of the cells
  6. 9. you may put this in your tea or coffee